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// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
using System;
using System.IO;
using System.Collections;
namespace WixToolset.Dtf.Tools.DDiff
{
public interface IDiffEngine
{
float GetDiffQuality(string diffInput1, string diffInput2, string[] options, IDiffEngineFactory diffFactory);
bool GetDiff(string diffInput1, string diffInput2, string[] options, TextWriter diffOutput, string linePrefix, IDiffEngineFactory diffFactory);
IDiffEngine Clone();
}
public interface IDiffEngineFactory
{
IDiffEngine GetDiffEngine(string diffInput1, string diffInput2, string[] options);
}
public class BestQualityDiffEngineFactory : IDiffEngineFactory
{
public virtual IDiffEngine GetDiffEngine(string diffInput1, string diffInput2, string[] options)
{
float bestDiffQuality = 0;
IDiffEngine bestDiffEngine = null;
foreach(IDiffEngine diffEngine in diffEngines)
{
float diffQuality = diffEngine.GetDiffQuality(diffInput1, diffInput2, options, this);
if(diffQuality > bestDiffQuality)
{
bestDiffQuality = diffQuality;
bestDiffEngine = diffEngine;
}
}
return (bestDiffEngine != null ? bestDiffEngine.Clone() : null);
}
public BestQualityDiffEngineFactory() : this(null) { }
public BestQualityDiffEngineFactory(IDiffEngine[] diffEngines)
{
this.diffEngines = (diffEngines != null ? new ArrayList(diffEngines) : new ArrayList());
}
protected IList diffEngines;
public virtual void Add(IDiffEngine diffEngine)
{
diffEngines.Add(diffEngine);
}
public virtual void Remove(IDiffEngine diffEngine)
{
diffEngines.Remove(diffEngine);
}
public IList DiffEngines
{
get
{
return ArrayList.ReadOnly(diffEngines);
}
}
}
}
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